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Introduction: Non-surgical treatment with calcium hydroxide offers a high success rate in the healing of large periapical lesions. Case Series: We present the healing of large periapical lesions with conservative, non-surgical treatment in three young patients presenting large periapical lesions and diagnosed with chronic periapical periodontitis. Non-surgical endodontic treatment was carried out involving canal preparation, irrigation with 2.5% sodium hypochlorite, filling of the canal with 75% calcium hydroxide and 25% Kri-1 iodoform paste mixed with sterile saline solution, and sealing of the cavity with composite. The filling was replaced several times, after which endodontic treatment was finally carried out. Complete apical healing was observed in all cases. Conclusion: Non-surgical treatment as a first option allows us to avoid the trauma of surgery in young individuals.

Aims: Ectopic eruption is a change in the normal path of eruption of a tooth. The aim of this study is to determine the prevalence of ectopic eruption of the permanent maxillary first molars in a Spanish subpopulation of 505 children, its distribution as regards age and gender, unilateral and bilateral occurrence and loss of space. Methods: Periapical and panoramic X-rays were taken of the patients, with six-monthly check-ups to evaluate development. A statistical analysis of the data was performed using the chi-square test (p lessthan 0.05, 95% C.I). Results: A prevalence of 6.7% was obtained being the most common age of presentation was seven years and bilateral occurrence (67.6% of cases) with no statistically significant differences as regards to the gender. Only 14 of the 505 explored patients required treatment for ectopic eruption. Conclusion: This study provides information regarding treatment needs and prevalence regarding molar ectopic eruption in a Spanish population. It is essential for professionals to be familiar with the diagnostic factors, clinical consequences and therapeutic options for ectopic eruption of permanent molars.